JUICE and Europa Clipper Capture Unique Data on Interstellar Comet 3I/ATLAS
Both Hemispheres of 3I/ATLAS Observed Simultaneously by JUICE and Europa Clipper
Universe Today
Image: Universe Today
In December 2025, ESA's Jupiter ICy Moon Explorer (JUICE) and NASA's Europa Clipper simultaneously observed interstellar comet 3I/ATLAS as it passed through the Solar System. This collaboration provided unprecedented insights into the comet's internal chemical composition, revealing emissions of hydrogen, oxygen, and carbon, which help scientists understand its origin and compare it with Solar System comets.
- 013I/ATLAS is the third interstellar object detected in the Solar System, with observations revealing its internal chemical composition.
- 02The Ultraviolet Spectrograph instruments on both JUICE and Europa Clipper were pivotal in capturing simultaneous images of the comet's two hemispheres.
- 03Higher-than-expected carbon emissions were detected, confirming previous findings from other missions.
- 04The study of the comet provides insights into the conditions of its origin star system compared to our own.
- 05This observation marked the first simultaneous direct views of a comet's coma from two spacecraft, enhancing the understanding of interstellar objects.
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In December 2025, the European Space Agency's Jupiter ICy Moon Explorer (JUICE) and NASA's Europa Clipper successfully captured simultaneous observations of interstellar comet 3I/ATLAS after it emerged from behind the Sun. This event marked a significant milestone, as it was only the third interstellar object detected in the Solar System. The Ultraviolet Spectrograph (UVS) instruments aboard both spacecraft provided critical data on the comet's internal chemical composition, revealing emissions of hydrogen, oxygen, and carbon. Dr. Kurt Retherford, principal investigator for the UVS instruments, highlighted the importance of informal coordination between the two missions, which allowed for unique observations of the comet as it passed between them. The researchers found unexpectedly high levels of carbon emissions, confirming earlier findings and showcasing the dynamic nature of the comet's composition as it traveled through the Solar System. This research not only enhances our understanding of 3I/ATLAS but also offers valuable comparisons with comets native to our Solar System, aiding in the exploration of conditions in other star systems.
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